If you want to run the scenario, on another machine, you will need to adjust the command-line to point to their local Java and JavaFX installation. You may find it easier to get them to install Greenfoot (which comes with Java and JavaFX) and play the scenario within Greenfoot, or to export it to this website and let them play online.
What does it mean to adjust the command-line to point to their local Java and JavaFX installation? Which part of the command do I change? Is it just at the end of the second "/private... " block where there's a path to a filename like Greenfoot.app/Contents/Resources/Java/javafx/lib/javafx.web.jar:/Users/username/pathtofile/filename.jar" --module-path ? Are there other part s of the command I have to change?